tmakin/tegra-linux-noble
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/i915/display: Increase number of fast wake precharge pulses

Browse Source 
BugLink: https://bugs.launchpad.net/bugs/2046315

Increasing number of fast wake sync pulses seem to fix problems with
certain PSR panels. This should be ok for other panels as well as the eDP
specification allows 10...16 precharge pulses and we are still within that
range.

v3: mention laptop model and panel manufacturer and model in comment
v2: add comment explaining pulse count is increased

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9739
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240313133221.868391-5-jouni.hogander@intel.com
(cherry picked from commit f77772866385cd0a72311a9e2ac176214d2b0fa8 linux-next)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Acked-by: Guoqing Jiang <guoqing.jiang@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Jouni Högander
2024-04-16 14:04:16 +08:00
committed by Stefan Bader
parent e6b076d508
commit 1d395ab43e
1 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/i915/display/intel_dp_aux.c
+7 -1
View File
@@ -144,7 +144,13 @@ static int intel_dp_aux_sync_len(void)
int intel_dp_aux_fw_sync_len(void)
{
int precharge = 10; /* 10-16 */
/*
* We faced some glitches on Dell Precision 5490 MTL laptop with panel:
* "Manufacturer: AUO, Model: 63898" when using HW default 18. Using 20
* is fixing these problems with the panel. It is still within range
* mentioned in eDP specification.
*/
int precharge = 12; /* 10-16 */
int preamble = 8;
return precharge + preamble;